Monitoring Disk Paths

This section describes two methods for monitoring disk paths in your
cluster. The first method is provided by the cldevice command.
Use this command to monitor, unmonitor, or display the status of disk paths
in your cluster. You can also use this command to print a list of faulted
disks and to monitor disk paths from a file. See the cldevice(1CL) man page.

Issue the cldevice command with the disk
path argument from any active node to perform DPM administration tasks on
the cluster. The disk path argument consists of a node name and a disk name.
The node name is not required. If you do not specify a node name, all nodes
are affected by default. The following table describes naming conventions
for the disk path.

Note –

Always specify a global disk path name rather than a UNIX disk
path name because a global disk path name is consistent throughout a cluster.
A UNIX disk path name is not. For example, the disk path name can be c1t0d0 on one node and c2t0d0 on another node. To determine
a global disk path name for a device that is connected to a node, use the cldevice list command before issuing DPM commands.
See the cldevice(1CL) man
page.

Table 3–3 Sample
Disk Path Names

Name Type

Sample Disk Path Name

Description

Global disk path

schost-1:/dev/did/dsk/d1

Disk path d1 on the schost-1 node

all:d1

Disk path d1 on all nodes in the cluster

UNIX disk path

schost-1:/dev/rdsk/c0t0d0s0

Disk path c0t0d0s0 on the schost-1 node

schost-1:all

All disk paths on the schost-1 node

All disk paths

all:all

All disk paths on all nodes of the cluster

Using Sun Cluster Manager to Monitor
Disk Paths

Sun Cluster Manager enables you to perform the following basic DPM administration
tasks:

Monitor a disk path

Unmonitor a disk path

View the status of all monitored disk paths in the cluster

Enable or disable the automatic rebooting of a Solaris host
when all monitored shared-disk paths fail

The Sun Cluster Manager online help provides procedural information
about how to administer disk paths

Using the clnode set Command to
Manage Disk Path Failure

You use the clnode set command to enable and disable
the automatic rebooting of a node when all monitored shared-disk paths fail. When you enable the reboot_on_path_failure property, the states of local-disk paths are not considered when
determining if a node reboot is necessary. Only monitored shared disks are
affected. You can also use Sun Cluster Manager to perform
these tasks.